Lucas I. Quass

  • Associate
  • 650 Town Center Drive
  • 20th Floor
  • Costa Mesa, CA 92626-1925
  • USA
  • T +1.714.755.8132


Lucas Quass is an associate in the Environment, Land & Resources Department of Latham & Watkins. He focuses his practice on environmental matters, involving water, natural resources, and land use law.

Mr. Quass practices environmental law, with an emphasis on California water law and policy, major infrastructure improvements, and state court writ of mandamus and similar litigation. He provides advice to lenders, private developers, corporations, government entities, and nonprofit organizations regarding water rights in groundwater and surface water systems, and environmental matters related to the California Environmental Quality Act (CEQA).

Mr. Quass is also active in the firm’s pro bono program. He represents the Pasadena Roving Archers, a volunteer-run non-profit organization, in defense of land use entitlements to allow the continued operation of the historic Lower Arroyo Archery Range.

During law school, Mr. Quass was a law clerk at the Metropolitan Water District of Southern California. He was also the executive senior editor of the Southern California Review of Law and Social Justice, as well as a USC Law and Mental Health Scholar at the Saks Institute for Mental Health Law, Policy, and Ethics, and a recipient of the Edward & Eleanor Shattuck Award for Outstanding Service to the USC Law Center.

Mr. Quass is an adjunct professor at the University of Southern California Law School, where he teaches Persuasive Advocacy. Mr. Quass has also authored many articles and client alerts on new developments in land use, water resources, and environmental law.


Mr. Quass’ experience includes the following: 

  • Representation of a large multi-residential property owner in the Antelope Valley Groundwater Adjudication
  • Defended multiple challenges to development projects on CEQA and other grounds before California trial and appellate courts
  • Water rights and environmental due diligence for real estate finance companies, public agencies, and agricultural operations involving the purchase, sale, and lease of real property
  • Prepared water rights opinions for multimillion-dollar real property transactions

Thought Leadership

  • California Response to COVID-19: What Hotel Owners Need to Know  -  March 30, 2020
  • New Amendments to Prop 65 Regulations Aim to Clarify Warning Responsibility -  March 09, 2020
  • CEQA Case Report: Understanding the Judicial Landscape for Development — Full Report -  May 17, 2019
  • New York to Consider Imposing California Proposition 65-Like Labeling Requirements -  April 16, 2019
  • Recent Prop 65 Amendments Prompt Claims Against Online Alcohol Retailers in California -  April 04, 2019
  • How to Prepare for California’s Updated Prop 65 Regulations … 60-Second Overview  -  August 30, 2018
  • How to Prepare for California’s Prop 65 Update: Part 4  -  August 28, 2018
  • How to Prepare for California’s Updated Prop 65 Regulations: Part 3 -  August 09, 2018
  • How to Prepare for California’s Updated Prop 65 Regulations: Part 2 -  July 27, 2018
  • California WaterFix: an Historic Vote Is a Major Step Forward -  July 23, 2018
  • How to Prepare for California’s Updated Prop 65 Regulations: Part 1 -  July 16, 2018
  • CEQA Case Report Year in Review 2017: Understanding the Judicial Landscape for Development -  June 13, 2018
  • California Court of Appeal Approves Environmental Analysis for Oil Refinery Propane Recovery Project  -  May 01, 2018
  • California Court of Appeal Upholds City’s General Plan Update Against CEQA Challenge  -  February 27, 2018
  • California Supreme Court: CEQA Requires Study of Potential Impacts to ESHA -  April 04, 2017
  • Los Angeles Regional Water Quality Control Board Approves Second Extension to Malibu Septic Prohibition Deadlines -  February 13, 2017
  • Supreme Court Grants Certiorari in Clean Water Rule Case Jurisdictional Challenge -  February 06, 2017
  • A Look At New EPA Composite Wood Formaldehyde Limits -  January 31, 2017
  • Environmental Protection Agency Adopts National Limits on Formaldehyde Exposure for Composite Wood Products  -  January 18, 2017
  • California Supreme Court Addresses CEQA Supplemental Review; Rejects “New Project” Test -  October 03, 2016
  • Clean Energy Law Report: California Supreme Court Addresses Subsequent Review Under CEQA; Rejects Lishman “New Project” Test  -  September 21, 2016
  • Clean Energy Law Report: California Court of Appeal Partially Upholds Air Quality Thresholds of Significance Following State Supreme Court Decision -  August 26, 2016
  • Proposed Rule from U.S. Department of the Interior Increases Pressure on Coal Mining Industry -  November 01, 2015
  • Clean Energy Law Report: Sixth Circuit Stays Obama Administration’s New Clean Water Rule Nationwide -  October 15, 2015
  • Clean Energy Law Report: California Adopts Comprehensive Groundwater Basin Adjudication Law  -  October 13, 2015
  • Clean Energy Law Report: Federal Judge Grants Injunction Blocking Clean Water Rule From Taking Effect  -  September 03, 2015
  • Clean Energy Law Report: Proposed Rule from US Department of the Interior Increases Pressure on Coal Mining Industry -  July 30, 2015
  • EPA and Army Corps Issue Final Rule to Govern Federal Clean Water Act Jurisdiction -  June 09, 2015
Recognized as a Southern California Rising Star for Environmental Litigation.Super Lawyers 2018
Bar Qualification
  • California
  • JD, University of Southern California, 2011
    Order of the Coif
  • BA, University of California, Davis, 2005
  • Retail & Consumer Products
  • Energy & Infrastructure
  • Water Quality
  • Project Siting & Approvals
  • Environment, Land & Resources
  • Product Liability, Mass Torts & Consumer Class Actions
  • Environmental Litigation